docs: def summarize(manager: Manager):
      """Summarize the contents of the database."""
      click.echo('Networks: {}'.format(manager.count_networks()))
      click.echo('Edges: {}'.format(manager.count_edges()))
      click.echo('Nodes: {}'.format(manager.count_nodes()))
      click.echo('Namespaces: {}'.format(manager.count_namespaces()))
      click.echo('Namespaces entries: {}'.format(manager.count_namespace_entries()))
      click.echo('Annotations: {}'.format(manager.count_annotations()))
      click.echo('Annotation entries: {}'.format(manager.count_annotation_entries()))